Hi!
I am having difficulty at pausing an acquisition signal.
Attached are the vi I use: the "INIT_SCAN" is the first one, then come "GET_SCAN" and "CLOSE_SCAN". I believe the modifications I need to do should only be done in INIT SCAN but I attached the others just in case.
My NI card: NI USB-6353, USB X Series.
Here's my problem:
So far I have been able to pause the analog output signal and I would like to pause the counter output whenever the analog output is on pause, so that I don't read any information during that time. Unfortunately I couldn't find anything that works.
The first counter (CO) I use is the one that creates the gate of the second one (CI), and the second one counts the pulses received by my photodetector.
My problem seems to come from the very nature of the counter, because I can pause an analog input at the same time I pause my analog output without any problem. To do so, I just share the sample clock of my analog output with my analog input (-> second line of my INIT_SCAN.vi).
I tried to use a sample clock instead of an "Implicit" timing for my counters (I tried on both counters, on the model of my analog input signal) but it didn't work, including with "Continuous Samples" (I read somewhere that I needed continuous sampling to implement a pause on a counter..?).
The error was happening in the GET_SCAN.vi, at the start task of my counter and LabVIEW suggested: "Set the buffer higher to zero, do not configure Sample Clk Timing or set Sample timing type to On Demand".
I followed these suggestions and added a buffer of size "1000" right before the start task and put the "On Demand" mode to the Sample Clock of my CO, but this only shifted the problem from the start task of the CO to the reading task of the CI.
I also tried to directly use a pause trigger property node for my counter but it did not work either. What I discovered is that LabView seems to "accept' digital pause trigger but not analog pause triggers for counters.
So I could sum up my problem like this:
1) What I think should be best is to pause the gate of the counter input, which is why I focused on the counter output. Should I instead focus on the timing of the counter input itself?
2) Is there a way to synchronize my counter output with my analog output signal the same way I synchronized my analog input? (hardware)
3) If not, is there a way to pause my counter "independtly" (using a property node most likely) with an analog signal?
If I didn't give all the information needed, please tell me,
Hope any one can help 
Thanks a lot for your time,
Estelle